This post works:

POST / HTTP/1.1
Host: localhost:8000
User-Agent: curl/7.43.0
Accept: */*
Content-Length: 1491
Content-Type: multipart/form-data; boundary=------------------------d5df43b5a725393f

--------------------------d5df43b5a725393f
Content-Disposition: form-data; name="sysmeta"; filename="sys.xml"
Content-Type: application/xml

<?xml version="1.0" encoding="UTF-8"?><d1_v2.0:systemMetadata xmlns:d1_v2.0="http://ns.dataone.org/service/types/v2.0" xmlns:d1="http://ns.dataone.org/service/types/v1"><serialVersion>1</serialVersion><identifier>seadva-75293493-b79e-4581-a6a0-92d084bd05cf</identifier><formatId>FGDC-STD-001-1998</formatId><size>2934</size><checksum algorithm="SHA-1">7621c9bb6a7b3b3bc304400b67e002431e2cd7f9</checksum><submitter>SEAD</submitter><rightsHolder>NCED</rightsHolder><accessPolicy><allow><subject>public</subject><permission>read</permission></allow></accessPolicy><replicationPolicy replicationAllowed="false"/><archived>false</archived><dateUploaded>2016-06-16T21:10:50.654+00:00</dateUploaded><dateSysMetadataModified>2016-06-16T21:10:50.654+00:00</dateSysMetadataModified><originMemberNode>urn:node:mnTestSEAD</originMemberNode><authoritativeMemberNode>urn:node:mnTestSEAD</authoritativeMemberNode><replica><replicaMemberNode>urn:node:mnTestSEAD</replicaMemberNode><replicationStatus>completed</replicationStatus><replicaVerified>2016-07-11T22:33:15.846+00:00</replicaVerified></replica><replica><replicaMemberNode>urn:node:cnStage</replicaMemberNode><replicationStatus>completed</replicationStatus><replicaVerified>2016-07-11T22:33:15.854+00:00</replicaVerified></replica></d1_v2.0:systemMetadata>
--------------------------d5df43b5a725393f--



This post does not:

POST / HTTP/1.1
Host: 127.0.0.1:8000
Connection: keep-alive
Content-Length: 1436
Accept: */*
Origin: chrome-extension://pgmbeogiaebijlfkcohcconnhpeclcke
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryO3lAOucvBuNO5uGa
DNT: 1
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8

------WebKitFormBoundaryO3lAOucvBuNO5uGa
Content-Disposition: form-data; name="sysmeta"

<?xml version="1.0" encoding="UTF-8"?><d1_v2.0:systemMetadata xmlns:d1_v2.0="http://ns.dataone.org/service/types/v2.0" xmlns:d1="http://ns.dataone.org/service/types/v1"><serialVersion>1</serialVersion><identifier>seadva-75293493-b79e-4581-a6a0-92d084bd05cf</identifier><formatId>FGDC-STD-001-1998</formatId><size>2934</size><checksum algorithm="SHA-1">7621c9bb6a7b3b3bc304400b67e002431e2cd7f9</checksum><submitter>SEAD</submitter><rightsHolder>NCED</rightsHolder><accessPolicy><allow><subject>public</subject><permission>read</permission></allow></accessPolicy><replicationPolicy replicationAllowed="false"/><archived>false</archived><dateUploaded>2016-06-16T21:10:50.654+00:00</dateUploaded><dateSysMetadataModified>2016-06-16T21:10:50.654+00:00</dateSysMetadataModified><originMemberNode>urn:node:mnTestSEAD</originMemberNode><authoritativeMemberNode>urn:node:mnTestSEAD</authoritativeMemberNode><replica><replicaMemberNode>urn:node:mnTestSEAD</replicaMemberNode><replicationStatus>completed</replicationStatus><replicaVerified>2016-07-11T22:33:15.846+00:00</replicaVerified></replica><replica><replicaMemberNode>urn:node:cnStage</replicaMemberNode><replicationStatus>completed</replicationStatus><replicaVerified>2016-07-11T22:33:15.854+00:00</replicaVerified></replica></d1_v2.0:systemMetadata>
------WebKitFormBoundaryO3lAOucvBuNO5uGa--